Index: dml/moodle_database.php
===================================================================
RCS file: /cvsroot/moodle/moodle/lib/dml/moodle_database.php,v
retrieving revision 1.38
diff -u -r1.38 moodle_database.php
--- dml/moodle_database.php	21 Jul 2008 07:18:58 -0000	1.38
+++ dml/moodle_database.php	24 Jul 2008 09:42:50 -0000
@@ -86,6 +86,19 @@
     }
 
     /**
+     * Loads and returns a driver instance with the specified type and library.
+     * @param string $type database type of the driver (mysql, postgres7, mssql, etc)
+     * @param string $library database library of the driver (adodb, pdo, etc)
+     * @return moodle_database driver object
+     */
+    public static function get_driver($type, $library = 'adodb') {
+        global $CFG;
+        $classname = $type . '_' . $library . '_moodle_database';
+        require_once ("$CFG->libdir/dml/$classname.php");
+        return new $classname ();
+    }
+
+    /**
      * Returns database family type - describes SQL dialect
      * Note: can be used before connect()
      * @return string db family name (mysql, postgres, mssql, oracle, etc.)
Index: simpletest/fixtures/gradetest.php
===================================================================
RCS file: /cvsroot/moodle/moodle/lib/simpletest/fixtures/gradetest.php,v
retrieving revision 1.39
diff -u -r1.39 gradetest.php
--- simpletest/fixtures/gradetest.php	22 Jun 2008 16:51:55 -0000	1.39
+++ simpletest/fixtures/gradetest.php	24 Jul 2008 09:41:50 -0000
@@ -87,7 +87,7 @@
 
         if (is_null(grade_test::$db)) {
             $this->realdb = $DB;
-            grade_test::$db = new mysqli_adodb_moodle_database();
+            grade_test::$db = moodle_database::get_driver($CFG->dbtype, $CFG->dblibrary);
             grade_test::$db->connect($CFG->dbhost, $CFG->dbuser, $CFG->dbpass, $CFG->dbname, $CFG->dbpersist, "mdl_unittest_");
         }